What hair color would I look best in: Ashley Simpson’s auburn hair or, a dark or medium brown?

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Hi, my name is Cailynn and I would like to know what hair color I would look good in, my face shape is like a mixture with heart shaped and oval. (Mostly heart, especialy near the jaw line) I think i might look good in an auburn or medium hair color, but I’m not even sure if I should color my hair. I have a very light tan color to my skin, or I’m kind of pale.. I tend to have rosey cheeks and my eye color is hazel. (greenish and grey) last but not least my hair right now is a dirty blonde color, and my eyebrows are a light brown. thanks and be as honest as you can be: here is a link to my picture of right now: http://www.facebook.com/photo.php?pid=1534819&id=526166400 and http://www.facebook.com/photo.php?pid=1534819&id=526166400#/photo.php?pid=1608232&id=526166400
Oops! sorry about the facebook thing! I really had no other way of showing you guys my hair color and pretty much me..lol sorry..